.R_dark {
    background-image: url('https://pic1.zhimg.com/v2-05c016ae393b157262935c6b42fe9f57_r.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    height: 100vh;


}

.R_light {
    background-image: url('https://wallpaperm.cmcm.com/a84e58e6b575648d212fcecdc36ae8ad.jpg');
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    height: 100vh;


}

.login {
    padding: 10px;
    transition: all 1s;
    border-radius: 10px;
}

.login:hover {
    transform: translateY(-10px);
}